linux-kernel - Re: [PATCH 1/2] dt-bindings: leds: backlight: Add Awinic AW99706 backlight

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Message-ID: <c17c10d4-cc1f-46fd-8719-e7bb9ffa91ba@kernel.org>
Date: Sun, 26 Oct 2025 14:47:59 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Junjie Cao <caojunjie650@...il.com>, Lee Jones <lee@...nel.org>,
 Daniel Thompson <danielt@...nel.org>, Jingoo Han <jingoohan1@...il.com>,
 Pavel Machek <pavel@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Helge Deller <deller@....de>
Cc: dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: leds: backlight: Add Awinic AW99706
 backlight

On 26/10/2025 13:39, Junjie Cao wrote:
> +
> +  reg:
> +    maxItems: 1
> +
> +  enable-gpios:
> +    description: GPIO to use to enable/disable the backlight (HWEN pin).
> +    maxItems: 1
> +
> +  awinic,dim-mode:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: >
> +      Select dimming mode of the device.
> +        0 = Bypass mode.
> +        1 = DC mode.
> +        2 = MIX mode.
> +        3 = MIX-26k.
> +    enum: [0, 1, 2, 3]
> +    default: 1
> +
> +  awinic,sw-freq:

Please use proper units, see:
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml
and other examples

Same everywhere else.


> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Boost switching frequency in kHz.
> +    enum: [300, 400, 500, 600, 660, 750, 850, 1000, 1200, 1330, 1500, 1700]
> +    default: 750
> +
> +  awinic,sw-ilmt:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Switching current limitation in mA.
> +    enum: [1500, 2000, 2500, 3000]
> +    default: 3000
> +
> +  awinic,iled-max:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Maximum LED current setting in uA.
> +    minimum: 5000
> +    maximum: 50000
> +    multipleOf: 500
> +    default: 20000
> +
> +  awinic,uvlo-thres:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: UVLO(Under Voltage Lock Out) in mV.
> +    enum: [2200, 5000]
> +    default: 2200
> +
> +  awinic,fade-time:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Fade In/Out Time(per step) in us.
> +    enum: [8, 16, 32, 64, 128, 256, 512, 1024]

Why would this be fixed setting? This really looks like runtime, drop.

> +    default: 16
> +
> +  awinic,slope-time:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Slope time in ms.

Slope of what?

> +    enum: [8, 24, 48, 96, 200, 300, 400, 500]
> +    default: 300
> +
> +  awinic,ramp-ctl:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: >
> +      Select ramp control and filter of the device.
> +        0 = Fade in/fade out.
> +        1 = Light filter.
> +        2 = Medium filter.
> +        3 = Heavy filter.
> +    enum: [0, 1, 2, 3]
> +    default: 2
> +
> +  awinic,brt-mode:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: >
> +      Select brightness control of the device.
> +        0 = PWM.
> +        1 = IIC.
> +        2 = IIC x PWM.
> +        3 = IIC x PWM(P-ramp).
> +    enum: [0, 1, 2, 3]
> +    default: 1
> +
> +  awinic,onoff-time:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Turn on/off time(per step) in ns.
> +    enum: [250, 500, 1000, 2000, 4000, 8000, 16000]

Not a DT property.

> +    default: 2000
> +
> +required:
> +  - compatible
> +  - reg
> +  - enable-gpios
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        aw99706@76 {
> +            compatible = "awinic,aw99706";
> +            reg = <0x76>;
> +            enable-gpios = <&tlmm 88 GPIO_ACTIVE_HIGH>;

Where are other properties from common.yaml? Looks like you re-invented
some parts.



Best regards,
Krzysztof